/* ============================================================
   FLORENCIA SEPÚLVEDA · PORTFOLIO
   Brutalist Minimal · Design System
   ------------------------------------------------------------
   Single source of truth. No inline styles, no <style> blocks.
   Paper is white, ink is black. All color comes from projects,
   injected through the --accent token (see THEMES below).
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Oswald:wght@300;400;500;600;700&family=Poppins:wght@400;500;600;700&display=swap');

/* ============================================================
   1 · DESIGN TOKENS
   ============================================================ */
:root {
  /* ---- Color ---- */
  --paper:      #ffffff;
  --ink:        #000000;
  --ink-70:     rgba(0, 0, 0, 0.70);
  --ink-45:     rgba(0, 0, 0, 0.45);
  --paper-70:   rgba(255, 255, 255, 0.70);
  --paper-45:   rgba(255, 255, 255, 0.45);

  /* Accent — neutral by default. Color only arrives with a theme. */
  --accent:     #000000;
  --on-accent:  #ffffff;

  /* ---- Type ---- */
  --font-display: 'Oswald', 'Arial Narrow', sans-serif;
  --font-body:    'Poppins', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Fluid type scale — mobile-first mins, restrained desktop caps */
  --t-display:  clamp(2.5rem, 6.5vw, 6rem);
  --t-h1:       clamp(2.1rem, 5.5vw, 4.5rem);
  --t-h2:       clamp(1.85rem, 4vw, 3.25rem);
  --t-h3:       clamp(1.4rem, 2.6vw, 2.25rem);
  --t-lead:     clamp(1.05rem, 1.5vw, 1.375rem);
  --t-body:     clamp(0.95rem, 1vw, 1.0625rem);
  --t-label:    0.7rem;

  /* ---- Rhythm ---- */
  --gutter:     clamp(1.25rem, 4vw, 4rem);
  --section-y:  clamp(4.5rem, 11vw, 9rem);
  --max:        1500px;
  /* Horizontal padding that keeps full-width sections' inner content
     aligned to the centered max-width column. */
  --pad-x:      calc(var(--gutter) + max(0px, (100% - var(--max)) / 2));

  /* ---- Lines ---- */
  --rule:       2px solid var(--ink);
  --rule-thin:  1px solid var(--ink);
}

/* ============================================================
   2 · THEMES — the only place color enters the system.
   Applied as a class on <body> (case studies) or a card.
   ============================================================ */
.theme-1 { --accent: #42c2ff; --on-accent: #ffffff; } /* blue     */
.theme-2 { --accent: #ff2c88; --on-accent: #ffffff; } /* pink     */
.theme-3 { --accent: #7883fd; --on-accent: #ffffff; } /* violet   */

/* ============================================================
   3 · RESET & BASE
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; }

body {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* No italics anywhere — brutalist rule. */
i, em, cite, address { font-style: normal; }

a { color: inherit; }

::selection { background: var(--accent); color: var(--on-accent); }

/* Home hero is dark, so invert the selection there to stay visible */
.hero ::selection { background: var(--paper); color: var(--ink); }

/* ============================================================
   4 · TYPOGRAPHY PRIMITIVES
   ============================================================ */
.display {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  line-height: 0.92;
  letter-spacing: -0.01em;
}

.label {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.22em;
}

/* Emphasis inside copy = accent + heavy weight (never italic). */
strong { font-weight: 700; }

/* ============================================================
   5 · NAV
   ============================================================ */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.1rem var(--gutter);
  color: var(--paper);
  mix-blend-mode: difference;
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.nav.scrolled {
  mix-blend-mode: normal;
  background: var(--paper);
  color: var(--ink);
  border-bottom: var(--rule);
}

.nav-logo {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  text-decoration: none;
  color: inherit;
}

.nav-logo em { font-weight: 300; }

.nav-right { display: flex; align-items: center; gap: 1.75rem; }

.nav-link {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  text-decoration: none;
  color: inherit;
  padding-bottom: 2px;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s ease;
}

.nav-link:hover { border-bottom-color: currentColor; }

/* ----- Language toggle ----- */
.lang-toggle {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  padding: 0;
  line-height: 1;
}

.lang-globe {
  flex: none;
  width: 0.95em;
  height: 0.95em;
  display: block;
}

/* ----- Bilingual visibility ----- */
[data-lang="en"] [lang="es"],
[data-lang="es"] [lang="en"] {
  display: none;
}

/* ============================================================
   6 · HERO
   ============================================================ */
.hero {
  min-height: 100vh;
  padding: 9rem var(--pad-x) 4rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  background: var(--ink);
  color: var(--paper);
}

.hero-meta {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  flex-wrap: wrap;
  margin-bottom: 2.5rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.hero-meta::before {
  content: '';
  width: 48px;
  height: 2px;
  background: var(--paper);
}

.hero-title {
  font-family: var(--font-display);
  font-weight: 400;
  text-transform: uppercase;
  font-size: var(--t-display);
  line-height: 0.92;
  letter-spacing: -0.005em;
  margin-bottom: 2rem;
}

/* Accent words on the (monochrome) home: heaviest weight, no underline, no color. */
.hero-title .accent-fuchsia,
.hero-title .accent-turquoise {
  font-weight: 700;
}

.hero-sub {
  max-width: 54ch;
  font-size: var(--t-lead);
  font-weight: 400;
  line-height: 1.45;
  color: var(--paper-70);
  margin-top: 1.5rem;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 2.75rem;
}

.hero-tag {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  background: var(--paper);
  color: var(--ink);
  padding: 0.45rem 0.85rem;
}

/* No per-tag color on the monochrome home (dark hero → light tags). */
.hero-tag.fuchsia,
.hero-tag.turquoise { background: var(--paper); }

.hero-scroll {
  position: absolute;
  bottom: 2rem;
  left: var(--pad-x);
  display: flex;
  align-items: center;
  gap: 0.85rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.hero-scroll .line {
  width: 64px;
  height: 2px;
  background: var(--paper-45);
  position: relative;
  overflow: hidden;
}

.hero-scroll .line::after {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--paper);
  transform: translateX(-100%);
  animation: slide 2.4s ease-in-out infinite;
}

@keyframes slide {
  0%, 100% { transform: translateX(-100%); }
  50%      { transform: translateX(100%); }
}

/* ============================================================
   7 · SECTION SHELL
   ============================================================ */
.section {
  padding: var(--section-y) var(--pad-x);
  position: relative;
}

.section-num {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.5rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.section-num span {
  background: var(--ink);
  color: var(--paper);
  padding: 0.25rem 0.6rem;
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  font-size: var(--t-h2);
  line-height: 0.95;
  letter-spacing: -0.01em;
  margin-bottom: 3rem;
}

.section-title em {
  font-weight: 700;
  color: var(--accent);
}

/* ============================================================
   8 · ABOUT
   ============================================================ */
.about {
  border-top: var(--rule);
  border-bottom: var(--rule);
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: clamp(2rem, 5vw, 4rem);
  margin-top: 2rem;
}

.about-lead {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-h3);
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.about-lead em { font-weight: 700; color: var(--accent); }

.about-body {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  max-width: 52ch;
}

.about-body p { font-size: var(--t-body); line-height: 1.7; color: var(--ink-70); }
.about-body em { color: var(--ink); font-weight: 600; }

/* ============================================================
   9 · PROJECTS  (color blooms on hover — per-card theme)
   ============================================================ */
.projects { padding-top: clamp(4rem, 8vw, 6rem); }

.project-card {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: center;
  padding: clamp(2rem, 4vw, 3rem) 0;
  border-top: var(--rule);
  text-decoration: none;
  color: inherit;
  position: relative;
  transition: padding-left 0.35s cubic-bezier(.2,.8,.2,1), background-color 0.35s ease;
}

.project-card:last-of-type { border-bottom: var(--rule); }

.project-card:hover { padding-left: clamp(1rem, 2vw, 2rem); }

.project-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  line-height: 1;
  color: var(--ink-45);
  transition: color 0.25s ease;
}

.project-card:hover .project-num { color: var(--accent); }

.project-name {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  font-size: clamp(1.75rem, 3.6vw, 3.25rem);
  line-height: 0.95;
  letter-spacing: -0.01em;
  transition: color 0.25s ease;
}

.project-card:hover .project-name { color: var(--accent); }

.project-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-top: 0.85rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--ink-70);
}

.project-result {
  margin-top: 0.7rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink);
  transition: color 0.25s ease;
}

.project-card:hover .project-result { color: var(--accent); }

.project-arrow {
  font-family: var(--font-display);
  font-size: 2.25rem;
  line-height: 1;
  transition: transform 0.3s ease, color 0.25s ease;
}

.project-card:hover .project-arrow {
  transform: translateX(12px);
  color: var(--accent);
}

/* ============================================================
   10 · CONTACT  (inverted block)
   ============================================================ */
.contact {
  background: var(--ink);
  color: var(--paper);
  padding: var(--section-y) var(--pad-x);
}

.contact .section-num { color: var(--paper-70); }
.contact .section-num span { background: var(--paper); color: var(--ink); }

.contact-title {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  font-size: var(--t-h1);
  line-height: 0.92;
  letter-spacing: -0.015em;
  margin-bottom: 3rem;
}

/* On the black home block, emphasis reads as underlined white (still no color). */
.contact-title em {
  font-weight: 700;
  box-shadow: inset 0 -0.1em 0 var(--paper);
}

.contact-lead {
  max-width: 52ch;
  font-size: var(--t-lead);
  font-weight: 400;
  line-height: 1.45;
  color: var(--paper-70);
}

.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  margin-top: 3rem;
  padding-top: 3rem;
  border-top: 2px solid var(--paper);
}

.contact-item-label {
  margin-bottom: 0.6rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--paper-45);
}

.contact-item a {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.35rem, 2.5vw, 2rem);
  text-transform: uppercase;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.25s ease;
}

.contact-item a:hover { border-bottom-color: var(--paper); }

.footer-meta {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: clamp(3rem, 6vw, 5rem);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--paper-45);
}

/* ============================================================
   11 · CASE STUDY · HERO
   ============================================================ */
.case-hero {
  padding: 10rem var(--pad-x) clamp(3rem, 6vw, 6rem);
  background: var(--ink);
  color: var(--paper);
}

.case-back {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  text-decoration: none;
  color: var(--paper);
  transition: gap 0.25s ease, color 0.25s ease;
}

.case-back:hover { gap: 1rem; color: var(--accent); }

.case-tag {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--accent);
}

.case-title {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  font-size: var(--t-h1);
  line-height: 0.9;
  letter-spacing: -0.015em;
  margin-bottom: 2rem;
}

.case-title em { font-weight: 700; color: var(--accent); }

.case-lede {
  max-width: 60ch;
  font-size: var(--t-lead);
  font-weight: 400;
  line-height: 1.4;
  color: var(--paper-70);
}

.case-meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: clamp(3rem, 6vw, 5rem);
  padding-top: 2.5rem;
  border-top: 1px solid var(--paper-45);
}

.case-meta-label {
  margin-bottom: 0.5rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--paper-45);
}

.case-meta-value {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  text-transform: uppercase;
  letter-spacing: 0.01em;
}

/* ============================================================
   11b · CASE STUDY · RESULTS-FIRST BAND
   ============================================================ */
.case-results {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(2.5rem, 5vw, 4rem) var(--gutter);
  border-bottom: var(--rule);
}

.case-result {
  padding-right: 2rem;
  border-right: var(--rule-thin);
}

.case-result + .case-result { padding-left: 2rem; }

.case-result:last-child { border-right: none; }

.case-result-num {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 5vw, 4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
}

.case-result-label {
  max-width: 26ch;
  margin-top: 0.75rem;
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.4;
  color: var(--ink-70);
}

@media (max-width: 768px) {
  .case-results { grid-template-columns: 1fr; }
  .case-result {
    padding: 1.5rem 0;
    border-right: none;
    border-bottom: var(--rule-thin);
  }
  .case-result + .case-result { padding-left: 0; }
  .case-result:last-child { border-bottom: none; }
}

/* ============================================================
   12 · CASE STUDY · CHAPTERS
   ============================================================ */
.chapter {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(4rem, 8vw, 7rem) var(--gutter);
  position: relative;
}

.chapter-label {
  margin-bottom: 2rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--t-h3);
  line-height: 1.05;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
}

.chapter-body {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: clamp(2rem, 5vw, 4rem);
  margin-top: 0;
}

.chapter-body p {
  max-width: 62ch;
  margin-bottom: 1.1rem;
  font-size: var(--t-body);
  line-height: 1.7;
  color: var(--ink-70);
}

.chapter-body p em { color: var(--ink); font-weight: 600; }

.chapter-body .pull {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(1.35rem, 2.2vw, 1.75rem);
  line-height: 1.25;
  letter-spacing: -0.005em;
  border-left: 4px solid var(--accent);
  padding-left: 1.5rem;
}

/* Chapter rhythm variants — full-bleed background, but the inner content
   stays aligned with the centered (max-width) plain chapters. */
.chapter--alt,
.chapter--dark {
  max-width: 100%;
  margin: 0;
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
}

.chapter--alt {
  background: var(--paper);
  border-top: var(--rule);
  border-bottom: var(--rule);
}

.chapter--dark {
  background: var(--ink);
  color: var(--paper);
}

.chapter--dark .chapter-body p { color: var(--paper-70); }
.chapter--dark .chapter-body p em { color: var(--paper); }
.chapter--dark .pull { color: var(--paper); }

/* ============================================================
   13 · IMAGE BLOCKS
   ============================================================ */
.image-block { margin: clamp(3rem, 6vw, 5rem) 0; }

.image-placeholder {
  aspect-ratio: 16 / 9;
  border: var(--rule);
  background: var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}

.image-placeholder::before {
  content: '';
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(
    45deg,
    transparent 0,
    transparent 14px,
    rgba(0, 0, 0, 0.06) 14px,
    rgba(0, 0, 0, 0.06) 15px
  );
}

.chapter--dark .image-placeholder {
  border-color: var(--paper);
  background: var(--ink);
}
.chapter--dark .image-placeholder::before {
  background-image: repeating-linear-gradient(
    45deg,
    transparent 0,
    transparent 14px,
    rgba(255, 255, 255, 0.08) 14px,
    rgba(255, 255, 255, 0.08) 15px
  );
}

.image-placeholder span {
  position: relative;
  z-index: 2;
  background: var(--ink);
  color: var(--paper);
  padding: 0.5rem 1rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.16em;
}
.chapter--dark .image-placeholder span { background: var(--paper); color: var(--ink); }

.image-caption {
  display: flex;
  gap: 1rem;
  margin-top: 1rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--ink-70);
}
.chapter--dark .image-caption { color: var(--paper-70); }

.image-caption .num {
  background: var(--accent);
  color: var(--on-accent);
  padding: 0.1rem 0.5rem;
}

.image-double {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 3vw, 2.5rem);
  margin: clamp(3rem, 6vw, 5rem) 0;
}

/* Real screenshots (replace the dashed placeholders) */
.image-shot {
  display: block;
  width: 100%;
  height: auto;
  border: 2px solid var(--ink);
}

.chapter--dark .image-shot { border-color: var(--paper); }

/* ============================================================
   14 · NEXT PROJECT
   ============================================================ */
.more-projects {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(3rem, 6vw, 5rem) var(--gutter) clamp(4rem, 8vw, 6rem);
}

.more-projects-label {
  margin-bottom: 0.5rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--ink-45);
}

.next-project {
  display: block;
  padding: var(--section-y) var(--gutter);
  background: var(--ink);
  color: var(--paper);
  text-align: center;
}

.next-project-email {
  display: inline-block;
  margin-top: 1.5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.1rem, 2vw, 1.6rem);
  text-transform: uppercase;
  letter-spacing: 0.02em;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: border-color 0.25s ease;
}

.next-project-email:hover { border-bottom-color: var(--accent); }

.next-project-label {
  margin-bottom: 1.5rem;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: var(--t-label);
  text-transform: uppercase;
  letter-spacing: 0.22em;
  color: var(--paper-45);
}

.next-project-name {
  font-family: var(--font-display);
  font-weight: 700;
  text-transform: uppercase;
  font-size: var(--t-h2);
  line-height: 0.95;
  letter-spacing: -0.01em;
}

.next-project-name em { font-weight: 700; }

/* ============================================================
   15 · SCROLL REVEAL
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(.2,.8,.2,1),
              transform 0.8s cubic-bezier(.2,.8,.2,1);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  .hero-scroll .line::after { animation: none; }
}

/* ============================================================
   16 · HAMBURGER
   ============================================================ */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: 4px;
  background: none;
  border: none;
  color: inherit;
  cursor: pointer;
  z-index: 101;
}

.nav-hamburger span {
  display: block;
  width: 24px;
  height: 2px;
  background: currentColor;
  transform-origin: center;
  transition: transform 0.35s cubic-bezier(.2,.8,.2,1), opacity 0.2s ease;
}

/* ============================================================
   17 · RESPONSIVE
   ============================================================ */
@media (max-width: 900px) {
  .about-grid { grid-template-columns: 1fr; }
  .chapter-body { grid-template-columns: 1fr; }
  .case-meta { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .contact-grid { grid-template-columns: 1fr; gap: 2rem; }
  .image-double { grid-template-columns: 1fr; }

  .project-card { grid-template-columns: auto 1fr; gap: 1.25rem; }
  .project-arrow { display: none; }
}

@media (max-width: 767px) {
  /* Nav → fullscreen overlay */
  .nav-hamburger { display: flex; }

  .nav-right {
    position: fixed;
    inset: 0;
    z-index: 98;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    background: var(--paper);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-0.75rem);
    transition: opacity 0.35s ease, transform 0.35s ease, visibility 0s linear 0.35s;
  }

  .nav.open .nav-right {
    visibility: visible;
    opacity: 1;
    transform: none;
    transition: opacity 0.35s ease, transform 0.35s ease, visibility 0s linear 0s;
  }

  .nav.open {
    mix-blend-mode: normal;
    background: var(--paper);
    color: var(--ink);
  }

  .nav.open .nav-hamburger span:nth-child(1) { transform: translateY(8px) rotate(45deg); }
  .nav.open .nav-hamburger span:nth-child(2) { opacity: 0; transform: scaleX(0); }
  .nav.open .nav-hamburger span:nth-child(3) { transform: translateY(-8px) rotate(-45deg); }

  .nav-right .nav-link {
    font-family: var(--font-display);
    font-weight: 700;
    font-size: clamp(2.5rem, 13vw, 4rem);
    letter-spacing: -0.01em;
    border-bottom: none;
    color: var(--ink);
  }
  .nav-right .nav-link:hover { color: var(--accent); }

  .nav-right .lang-toggle {
    font-size: clamp(2.5rem, 13vw, 4rem);
    font-weight: 700;
    letter-spacing: -0.01em;
    gap: 0.6rem;
    color: var(--ink);
  }
  .nav-right .lang-globe { width: 0.7em; height: 0.7em; }

  body.nav-open { overflow: hidden; }

  .hero { padding: 7rem var(--gutter) 4rem; }
  .hero-meta { gap: 0.4rem; flex-direction: column; align-items: flex-start; }
  .hero-meta::before { display: none; }
  .hero-scroll { display: none; }

  .footer-meta { flex-direction: column; gap: 0.5rem; }

  .case-hero { padding: 7.5rem var(--gutter) 3rem; }
}
